James h



(Iio Model.) 2 Sheets-Sheet 1.

J. H. MATHEWS & J. WIMQGRANAHAN.

STEAM BOILER FURNACE.

No. 245,852. Patented Aug. 16,1881.

INYENTURE.

WITNESSES I ULVL ATTORNEYS;

N PFTR$ Plwlo-Lilhugmphnn Washington, D. c.

UNTT D STATES PATENT OFFICE.

JAMES H. MATHEWS AND JAMES W. MGGRANAHAN, OF WHEELING, \V.VA.

STEAM-BOILER FURNACE.

SPECIFICATION forming part of Letters Patent No. 245,852, dated August 16, 1881.

(No model.)

To all whom it may concern Be it known that we, JAMES H. MATHEWS and JAMES W. MOGRANAHAN, residents of the city of Wheeling, in the county of Ohio and State of West Virginia, have invented certain new andusefulImprovementsin Steam- Boiler Furnaces; and we do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters of reference marked thereon, which form a part of this specification.

Our invention relates specially to horizontal steam-boiler furnaces, but is also applicable, with slight modifications, to puddling and heating furnaces in which coal is used as fuel, the object being the effectual and economical burning of the smoke and gases arising from imperfect combustion of the coal, thereby saving a large percentage of the fuel and increasing the efliciency of the furnace by obtaining a larger amount of heat from a given quantity of coal than heretofore, and also mitigating, in a great measure, the smoke nuisance which pertains to large manufacturing cities.

It consists of details of construction, all as hereinafter described and particularly claimed.

In the drawings, Figure 1 is a plan of the furnace Fig. 2, a vertical lengthwise section on line 0 0; Fig. 3, lengthwise section, Z Z, through side wall; Fig. 4, cross-section, XX; Fig. 5, View of front end of furnace.

Like letters of reference refer to like parts.

The letters A A A represent the side walls of the furnace. These walls are constructed with continuous flues B B B extending from the outside of the furnace at a point near the ground-line, with inlets provided with registers a a a for the admission of air upwardly back and forth, as shown in Fig. 3, and finally terminating with outlets b I) in the sides of the fire-box R.

G is thebridge-wall, constructed in the same manner, with a continuous flue through the heart of the wall, with an inlet provided with a register at a on the outside of the furnace, and terminating with an outlet, b on the rear side of the bridge-wall. The currents of fresh air passing through these flues serve to protect the walls from injury from excessive heat from the furnace, and the latent heat of the walls cuts the chill of the fresh air and delivers it, in a warm state, to the combustionchamber, thereby materially aiding the thorough and complete combustion of the the].

B is an air-flue constructed between the water-line tile 02 and the top of the boilers, which are covered over with tile or other suitable covering to form this air-passage. The flues in this particular case have an inlet provided with registers a a in the front of the furnace, and extend back to the after end of the boilers, thence across the ends of the boilers to the middle fines, and then forward to the front end, and terminate with an outlet, 1), directly over the fire-box. By means of this air-passage the heat from the top of the boilers is utilized.

D is a small furnace attached to the side of the main furnace, which, for convenience, we will call a superheater, its purpose being to superheat the steam-supply used in connection with the hot air introduced into the furnace, and also to heat the blast-pipe, which passes through the furnace from the fan on the outside. The smoke from this superheater is conveyed from the rear of the furnace over its crown, by means of a flue, c, to the forward end, where it is discharged into the firebox of the main furnace.

E is a steam-pipe extending from the steamdrum F over the boilers, through the superheater in a zigzag manner, to the rear of the fire-box, and thence across the party-wall to the top of the bridgewall of the main furnace, at which point it connects with a hollow trian gular-shaped metal coping, G,which extends across the furnace, on the top of the bridgewall. This coping is designed to cover the top edge of the bridge-wall, which is usually built of brick or tile to protect the same from injury from the fire, and is perforated along the side forming the back edge, in order to permit the steam entering the smoke-chamber H in the form of a spray in a direction toward the rear of the boilers to facilitate the draft. At 01 a branch connects with the main steampipe and extends across the after end of the boilers, and is provided with nozzles for the purpose of injectingsuperheated steam into the fines to clean them out, com monly called blow-- ing out the fines. The advantage in using the superheated steam is that it does not dampen the soot and cause it to adhere so tenaciously to the fines, as is the.case when ordinary steam is used.

J is an air-heating blast-pipe extending from a rotary fan, K, operated by steam or other power, through the body of the superheater in return-coils or other suitable form, and thence across the party-wall into the smoke-chamber H of the main furnace, where it is placed in a return-coil of sufficient surface to heat the inflowing air to a high degree, and finally terminating with a straight distributing-pipe across the furnace, parallel with the bridgewall and in close proximity thereto, having a series of small holes or perforations along its side to distribute the air evenly across the body of the furnace and create a strong uniform draft. The fresh air is forced into this pipe by means of the fan K. (Shown in Fig. 1.) m m are cross-walls built across the furnace, under and between the boilers, dividing the space approximately between the bridge-wall and rear wall of the furnace into three equal chambers. These cross-walls are perforated with a series of small openings, 6, to permit the heat and unconsnmed gases to pass through, under, and along the boilers. The object of these cross-walls is to retard the smoke and hold it in check as near the combustion-chamber as possible,in order that it may be exposed to the intense heat at that point sufficiently long to ignite and consume all its heat-giving properties before it reaches the after end of the boilers, where the heat is not sufficientto burn it, and consequently in the old style of furnace it passes unconsnmed up the chimney.

N is a steam-pipe connected with the exhaust-steam pipe on the engine and extending underneath the grate-bars across the front of the furnace. This pipe is perforated with small holes to permit the exhaust-steam to escape in a uniform steadyvolnme under the fire-bed for the purpose of cutting the chill, so called,

of the fresh air which naturally flows to the fire-bed, and by commingling with the products of combustion materially assists in creating a strong hot fire, which thoroughly consumes the coal, thus preventing clinkering and the consequent bnrnin g out of the grate-bars.

Having described our invention, what we claim, and desire to secure by Letters Patent of the United States, is-

1. The special construction forming the airheating chambers B consisting of the series of boilers, the water-line tile n, resting thereon a little below their tops and the top of the furnace, all as shown and described.

2. The combination, with a steam-boiler furnace, of a superheating-furnace forming part of the main furnace, for the purpose of heating the steam and hot-air supply required for the purposes of combustion, said furnace constructed with continuous air-heating flues in the walls and crown of the furnace to supply warm air to the combustion-chamber of the main furnace, substantially as herein shown.

3. The combination of the main furnace and boilers with the supplemental superheatingchamber D, steam-pipe E, extending from the top of the boilers through the superheater in a zigzag manner, and connecting with the perforated coping, substantially as described.

4. The combination of the superheating-furnace D with the main furnace and boilers, with the steam-pipe E and perforated bridgewall, and with the pipe J, partly located in the furnace D and partly in the space in rear of the bridge, part of pipe J in rear of said bridge being perforated, substantially as described.

In testimony that we claim the foregoing as our own we hereunto affix our signatures in presence of two witnesses.

JAMES H. MATHEWS. JAMES W. MOGRANAHAN.

\Vitnesses:

WM. S. TIPPETT, GEO. K. STORM. 

